SAP ABAP ASJSON REFERENCE VAR documentation, setup help and example usage

ARTICLE

asJSON - Named Reference Variables
Like a regular data object, a named reference variable is represented as an object component that has special content:
"bni":{ "%ref":"#key" }
The content of the object component of a named reference variable is an object with precisely one object component, called %ref . The content of the object component %ref is a character-like value "#key" , where key is the unique key of an object component in the object %heap . The object of an initial reference is empty. The key key of the ABAP runtime environment is set in serializations; in deserializations, any key can be used.
Otherwise the same rules apply to serializations and deserializations of named reference variables as to
asJSON and the same special cases need to be noted.

Example
See Serializing Data References .